russom



2 Sheets-Sheet l.

(No Model.)

C; H. BUSSUM.

MICROMET'ER.

Patented Sept WITNESSES wwm N. PKTERS. PholwMMgrlDMr. Walhmgwn. 0.12.

(No M0331.) 2 sn'eens-sheet 2.

` 0. H. BUSSUM.

MIGROMETER.

N. PETERS, Phmvuuwgnvhar. vlamingen. n, c.

IVO

Uniran trarne? Parent Erice.

CHARLES H. RUssoM, or SPRINGFIELD, ILLINeiS.

kIVIICROMETER SPECIFICATION forming part of Letters-Patent No. 305,337, dated September 16, 1884.

Application filed June 5, 1884;

fio/@ZZ whom it may concern.'

Be it known that I, CHARLES H. RUSsoM, a citizen of the United States, residing at Springfield, in the county of Sangamon and State of Illinois, have invented certain new and useful Improvements in Micrometers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked` thereon, which form a part of this specification- Figures l and 2 of the drawings are side views of my device. Fig. 3 is also a side view. Fig. 4. is a front view. Fig. 5 is a transverse section. Fig. 6 is a detail view, and Fig. 7 is a vertical sectional detail view.

The main object of the inventionis to construct a gage for planed or other flat work which will be capable of taking very minute measurements; and it mainly consists in supplementing a scale for comparatively large parts-such as inches and half-inches-attached to said gage by a scale for minute parts-for instance, the thousandth part of an inch-operated by a micrometerfscrew, hereinafter more fully described. A further object is to so construct the gage that it may be used as calipers for internal work, and also for surface external work.

In the accompanying drawings, A represents the base-plate of the device, having the upright or rod a rising vertically from it at any proper point. The upright a is made of any convenient height, and is graduated to any desirable unit of measure from the lower surface of the base-plate upward-for instance, half-inches-by the horizontal circumscribing grooves a' c', Ste. When the device is being used,the base-plate A rests on any convenient part of the bed B of the planing-machine.

Gis the carrier for the gage-point holder, composed of the tubular portion c andthe arms c and c?, extending backward and at :right angles to said tubular portion from the upper and lower ends of the same, respectively. The tubular portion c fits snugly over the upright c, and is held at any desired point thereon by means hereinafter described.

(No model.)

an'd cG is a bindingscrew to center the lower end of said tube, for a purpose hereinafter mentioned.

c7 is a vertical scale of equal parts onlthe outer surface of tlie tubecf, graduated to any desirable unit of. measure-for instance, onefortieth of an inch. X is the vertical line on said tube upon which the graduations are marked.

c8 is the expanded and rounded outer end of the arm c2, provided with the vertical opening c, and c10 is an adjusting-screw to 4engage the grooves a in the upright a and hold the carrier at anyvdesired point thereon.

D is a horizontal lcaf-spring fixed by one endto the surface ofthe carrier, (near the lower edge of thesan1e,) and having attached at right angles to its free end the detent-pin d. The detent-pin d enters an opening, c, in the carrier,` and engages with any one of the grooves c', thus holding the carrier at any desired point. This may be held by friction, if necessary.- u

E is a short rod screwing into the opening c", with its upper end, e, (which projects above said opening,) and its lower end, e', (extend ing below the opening 04,) pointed, for a purpose hereinafter mentioned. The gage-rod is passed through atrans'verse opening, h', in the top of the tubular portion H.

7L is a space between the rod G and the tu-A bul'ar portion H, for the passage of the tube c5 when the rodGis screwed down. The pointed lowerend,g, of the rod G may descend far enough to meet the pointed upper end of the piece E.

h is the beveled lower edge of the tubular portion H, graduated with any number of equal parts-for instance, twenty-ve-and fitting snugly over the tubeA ci". When the holder is turned, any mark of the graduated edge may be brought to the line X, and if the same edge is divided into twenty-five parts each part will represent the twenty-fifth of the distance between any two adjacent threads of the screw g.

IOO

h is a horizontal opening` through the head of sleeve H, into which is adj ustably tted the horizontal upper gage marker, K, provided with the depending point k, by which the thickness of the work being operated upon is measured.

71.3 is a vertical pointer on the upper end of the sleeve H, which, in conjunction with the point e', acts as inside calipers.

The operation of the device is as follows: The base-plate is rested on the bed of theplaning-machine at any convenient part, and the point 7c ofthe marker K is brought to bear upon the upper surface of the work. The halfinches are then read off the upright A, and fortieths of an inch from the line X on the tube c5. Any measurement less than the fortieth of an inch may be made by turning the proper mark on the beveled edge of the tubular point H into line with the vertical line X on the tube c5.

, When the device is made as above described, the distance between any two adjacent threads of the micrometer screw G should be onefortieth of an inch. Then each mark on the beveled edge of the tubular portion H would represent onc-thousandth part of an inch.

By means of the points e and l1.3 the device can be used as internal calipers for tubing and similar work, and by means of the meeting points of g and eit may be used as external calipers for small work.

The device may be used for anumber of purposes, among which are the following: first, to set the planer-tool at the proper height, cr by removing the piece E the carrier alone may be used for this purpose; second, to find the height of planed work 5 third, to score a line for the planer-tool to work to 5 fourth, to caliper large internal work by the outer points of E and F; fifth, to caliper small external work by the inner points of E and F; sixth, the carrier may be laid flat and measurements taken longitudinally.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination, in a gage for planed or other iiat work, of the base-plate A, provided with Y the upright a, graduated to any proper unit of measure, with the carrier C, having with the detent d, which enters an opening in Y said carrier and engages any one of the grooves a a of the upright a, substantially as specified.

3. In a gage, the combination, with the properly-graduated upright a and the carrier G, provided with the graduated tube 05,012 the gage-marker K, provided with thepoint 7c, the gage-point carrier F, composed of the micrometer-screw G and the tubular portion H, having its lower edge beveled and graduated to any desired number of equal parts, substantially as specified.

4. In a gage, the combination of the baseplate A, provided with the properly-graduated upright a, and the carrier C,provided with the properly-graduated tube c5, with the gagepoint holder F and gage-pointk, substantially as specified.

5. In a gage, the combination,with the properly-graduated upright a and the carrier C, provided with the arms c c2, of the rod E, having the pointed lower end, e., and the gage-point holder F, having on its upper end the pointer h3, substantially as specied.

6. In a gage, the combination, with the carrier C, provided with the arms c and c'l and tube c5, ofthe rod E, having the pointed upper and lower ends, and the part F, composed of the micrometer-screw Gand tubular portion H, and having upper and lower pointed ends, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

YCHARLES HENRY RUSSOM. 

